A topological characterisation of looped drainage networks

Hydrodynamic models are used to analyse water networks (water distribution, drainage, surface water, district heating, etc.). The non-linear nature of water flows necessitates the use of iterative solution methods in hydraulic modelling. This requires a relatively large computational effort. To reduce this effort, networks, network forcing...

Implementing circularity in the construction process: a case study examining the reorganization of multi-actor environment and the decision-making process

Circularity aims to make waste obsolete by both closing and narrowing resource loops and by extending the lifespan of materials and products. This fundamentally different approach to construction practices necessitates a completely different method of organising the construction process. The rounds of decision-making undertaken by different...

Multiscale Pattern Recognition of Transport Network Dynamics and its Applications: A bird’s eye view on transport

Cities are complex, dynamic and ever-evolving. We need to understand how these cities work in order to predict, control or optimize their operations. We have identified some open issues related to network and data complexity that need to be solved to build feasible methods for these purposes. To this end, we first build multiscale graphs...

Sediment Connectivity: A Framework for Analyzing Coastal Sediment Transport Pathways

Connectivity provides a framework for analyzing coastal sediment transport pathways, building on conceptual advances in graph theory from other scientific disciplines. Connectivity schematizes sediment pathways as a directed graph (i.e., a set of nodes and links). This study presents a novel application of graph theory and connectivity...

Analysis and Design of a Multi-Core Oscillator for Ultra-Low Phase Noise

In this paper, we exploit an idea of coupling multiple oscillators to reduce phase noise (PN) to beyond the limit of what has been practically achievable so far in a bulk CMOS technology. We then apply it to demonstrate for the first time an RF oscillator that meets the most stringent PN requirements of cellular basestation receivers while...

Urban Modality: Modelling and evaluating the sustainable mobility of urban areas in the city-region

This thesis proposes a framework for evaluating the mobility potential and performance of urban areas in the city region, as an instrument to support urban development that contributes positively to regional sustainable mobility objectives. The research takes a quantitative approach, modelling and measuring the characteristics of a city-region...

Exploiting Graph Properties for Decentralized Reputation Systems

In online communities, users frequently interact with strangers in order to buy and sell products, watch videos, educating themselves, and playing games. Establishing trust among strangers is essential for the functionality of these communities but challenging, as well. Online reputation systems effectively establish trust among strangers by...

Patterns of sustainable mobility and the structure of modality in the Randstad city-region

The sustainable mobility vision for city-regions proposes a more integrated and ‘seamless’ multi-modal public transport system around quality neighborhoods, shifting mobility to soft transportation modes and to public transport at various scales. Existing models of sustainable urban form address this challenge focusing on the location, density...

Patterns of sustainable mobility and the structure of modality in the Randstad city-region

A Robust Distributed Reputation Mechanism for Peer-to-Peer Systems

In P2P content distribution networks, incentive mechanisms are required for sustainable operation of the network. In general, there are two classes of incentive mechanisms, direct and indirect. In direct mechanisms, a content consumer compensates the work of a supplier by providing him some content in return. In indirect mechanisms, the work of...

Integrating public transort networks in the axial model

This study presents a first step in the development of a model that integrates public transport networks with the space syntax axial model, towards a network model that can describe the multi?modal movement structure of a city and study its patterns and flows. It describes the method for building an integrated multimodal network model of the...

Spatial metrics modeling to analyse correlations between urban form and surface water drainage performance.

Cities exhibit unique spatial patterns, and thus a distinctive heterogeneity. At different scales of influence, they introduce changes in the physical properties of the natural environment, as the diffusion of impervious surfaces. While climate change is expected to increase the frequency of hazards, patterns of urbanization might be critical in...

Network typology, junction typology and spatial configuration and their impacts on street vitality in Singapore

The aim of this paper is to develop a method for describing urban patter by means of simple mathematical calculations applicable for urban design. Two approaches were used and combined with one another. The first approach was Stephen Marshall’s method for calculating T-junctions and X-junctions seen in relationship with a cul-de-sac and network...

Analysing larger metropolitan areas: On identification criteria for middle scale networks

The aim of this paper is twofold. Firstly, it discusses how to analyse entire regions with the help of space syntax. Secondly, it demonstrates how a main route network through and between urban areas can be calculated in Depthmap. For this purpose one can combine angular choice with metrical distance and add various radiuses on top of each other...

The meaning of dwelling features: Conceptual and methodological issues

This study is about the meaning of dwelling features. It relates the research areas of housing preferences and the meaning of a dwelling with each other and with aspects of the means-end approach as applied in marketing research. It results in a conceptual and methodological framework for studying the meaning of preferences for dwelling features...

On Medium Distance Intermodal Rail Transport: A Design Method for a Road and Rail Inland Terminal Network and the Dutch Situation of Strong Inland Shipping and Road Transport Modes